Got it, seems 5870s are limited to oc, im running at 975/1275 with a voltage of 1.1250v. Best prog i've found is "Amd gpu clock tool", there is no fan control and Ati Overdrive isnt too friendly with other oc prog running. I actually lowered the voltage to get a decent overclock. Sapphire hd 5870 eyefinity 6 btw. Can I get some feedback with the same card and some other 5870 plz. Maybe if someone has the msi lightning could chime in im curious as to see if it has any more headroom for oc.